coburn



(No Model.)

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3 .N R U B.. ...C A J.

lENGrmwmer AND CHAsIG MACHINE.

N. Pneus mwulmmpmr. wumngwn. n. C

(No Model.) 's met-sheets.

J. A; GOBURN- *BNGRAVING AND GHASING MAGHINB.

1w 3a1,21.4.\ y Panente'dAprfl?,1888.1' f

N, PETERS. Phullithugnpher. Washington. D. C.

` To aZZ tchom it may concern: I

i chines, of which the following is a specificaof being readilyswung up for the purpose off applying a largeY or small pinion to one of the v'lheexactnumber and arrangement of these being to permit av great range of adjustment of variety of ways, so as to enable the cutter to gUNI",TED `STATESv v PATENTv ,EEICG l JOHN A. coBUEN, or SPRINGFIELD, MASSACHUSETTS, AssIGNOE To c; DUEBEE or NEWPORT, KENTUCKY..v

f 4Erleuxvluc. ANDY ceHkAslN'G rvIAcl-llmz.

SPECIFICATION forming part of Letters Patent No. 381.2174, dated Apri11'7.1ae.

e Application filed December U, 1887. Serial No. 258,421. (No model.)

' Be it kno/wnxthat I, Jol/1N A. COBURN, a citizen of the United States, residing at Springeld, in the county 'of Hampden,State of Massachusetts, have invented certain new and useful"l Improvements in Engraving and'Chasing Mation,reference being had therein to the accompanying drawings.

` My invention comprises a machine which is intended more especially for engraving and chasing the backs of watch-cases,although it can'be readily used for ornamenting various` other articles, the preferred construction Vof said machine being as follows: v

A suitable bench or table has mounted upon it a main spindle, whose frontend. carries a chuck or other means of attaching the watchback or other blank, said spindle having motion imparted `to it by a shaft that is turned by the operator. Furthermore, this `chuckspindle carries a wheel that gears with/a train of wheels for imparting motion to a iexible v connectionor connections, which latter driveV the roll or other ornamented die or pattern.

gear-wheelsis immaterial, as is also the con`` struction of the flexible connection, although said connections usually consist of universaljoint couplings, theobject of these couplingsa compound slide-rest" thatV carries thev tracer and cutter and has the ornamented pattern journaled upon it. This slide-rest is situated in front lof the chuck and can be shifted in a operate either on flat or crowning or other peculiar-shapedbacks or blanks.4 lhevchuck-l spindle yhas a longitudinallyf'slotted lever pivoted to ift, which lever affords journal-bear ings for a train of gear-wheels and is capablecounter-shafts, so as to vary the speed of the exible connections that drive the pattern, as hereinafter more fully described. p

. Another feature of -my inventionI consists in providing the slide-rest kwith a reciprocating slide operated by the tracer and havinga connection wherewith every motion of saidslide JoHN .is imparted to a ca-rriagethat is armedlwith ar l l,graver or other suitable cutting or chasing tool, as hereinafter morefully described.,

'A Another feature of my invention consists in j a novel construction of the compoun'dslide-y 55 rest, the details of the same" and the ,methodl of operating it being hereinafter more fully described. A Y f Anotherffeature of my invention consists in providing the slide-rest head with afscrew ble of being set so as to limit the .advance of 6o v, having a graduated head, which screw is capaf: f

the tool-carriage and the consequentpenetra- Y tion of the graver secured to said carriage, as hereinafter more fully'described. V Q e Another feature of myiiivention consists iu anovel combination of worm, tangent-screw, and pivoted `housing-for turning a swingingY rest, as.

plate pivoted to a sliding plate, of the `hereinafter more fully described. j

In thelannexed drawings, Figure 1 isa rear l' 'elevation of. anengraving and .chasirngmachine embodying mylimprovements. Fig. 2

is a side elevation o'faportion'ofmyzmachine, the uppervpart ofthe 'chuck-spindle pulley being broken away. Fig..3 is a. plan 'of the machine, said pulley being omitted. Fig.4

is an enlarged frontv elevation of thecompound I i slide-rest. Fig. v5 Lis a -rear .elevationfofi the same. Fig. 6` is a side elevation thereof, the

engraved roll or die being-sectioued,and"a bracket that supports .one of tlicbearin'gsof said die being broken away. Fig. 7 is a .planVV of a portionof the slide-rest, the .headvf the same being removed. Fig. 8 iis -an .enf larged side elevationof the tollcarriage,which carriage isshown vin its' advancedy position. e

Fig9 is an axial section of the shankfof the tangent screw-housing. Fig.fl`0ris.a front elevationof the foot of the shiftable standard of the main counter-shaft. K Referring to Fig.` 1, A represents aftable supported lupon .la suitable frame, fA, whose lower portion is provided with a shaft,c,"run-\ ning from the front to the rear yof thesanie,` said shaft beingfurni'shed with a pair of grooved pulleys, a a". byv a crossed belt or band, b, from the groovedy pulley b at therear end of shaft B, thelat'tenl being j ournaled kunder the table Aand having The front pulley, af, fisdriven a crank, b, convenient to the operator. The rear pulley, a', has a straight belt or band, c, that drives the grooved pulley c at the rear end of a spindle, C, the front end of the latter being provided with any approved form of chuck, o". (Seen in Fig. 3.) This chuck-spindle is journaled in bearings D D', projecting vertically from the table A, and carries a master-wheel, d, that communicates motion to a train of gear-pinions, d' d, the stud-shafts of said pinions being secured within the longitudinal slot e of a swinging lever, E, whose hub e turns on the spindle C. The opposite or free end of said lever` takes the shape of a handle, e. Projecting from the under side of this lever is an arm, F, having a curved slot, f, concentric with the chuck-spindle, said lever being held to any specific adjustment by a bolt, f', secured to a lug, f. Pinion d engages With a pinion, g, on the rear "end of a short shaft, G, journaled in bearings g and carrying a gear-wheel, g. This gear drives a Wheel, H, journaled in a fixed bearing, h,.

the hub of said Wheel being provided with a feather or pin, h', that traverses the longitudinal groove i of the main counter-shaft I, which latter has its front end journaled in the bearing j of a shiftable standard, J, whosebase has a dovetail foot, j', adapted to readily traverse an undercut groove, a, in the upper surface of the table, said foot and groove being more clearly shown in Fig. l0.

Bearing j has branches j, that supporta secondary countershaft, K, grooved longitudinally at lc to admit the feather or pin Z of the hub of a bevelpinion, L, that is driven by a similar pinion, Z, secured to the front end of shaft I. Shaft K has a universal-joint connection, k', to` which is attached a sleeve, M, whosefeather or pin m traverses the longitudinal groove n of another shaft, N, which l latter has a universal-joint connection, a, with the bearing o of the engraved roll or other suitable die, O, the opposite end of said roll being journaled on a bearing, o. These bearings are carried by brackets p p', projecting from the opposite sides of the slide-rest head P, whose front end has a knob or handle, 19, wherewith it is readily advanced or retracted, as occasion may require. Furthermore, this head P has a tongue,p, fitting within a dovev tailed groove on the under side of the headslide Q, which latter is advanced toward the roll or die O by springs q q', whose lower or fixed ends are secured to said head, as more clearly seen in Fig. 4. The upper surface of headslide Q has a tongue, q, fitting within an undercut groove on the under side of the traversing block R, which is moved along parallel with the die O by means of the feed-screw r. r is a hardened point, stub, or tracer car ried by this block and adapted to bear against I the peripheryY of the engraved roll, as more clearly seen in Fig. 6.

'91 is a link or other suitable coupling that connects the headslide Q with the tool-carriage S, in order that the reciprocating movements of said slide may be transferred directly to said carriage, the latter being provided with a clamp or holder, s, wherewith the graver, Chaser, or other cutting-tool, s', is heldin place. Carriage S is grooved on its under side, as at s, to admit a tongue of the head P, which head has a screw, T, tapped in it. The head of this screw is graduated and can be set to regulate the advance of the tool-carriage S, the

latter having avmark on it whereby the turni ing of the screw is regulated. In Fig. 5 this mark is indicated by the arrow t.

U is a clamp plate or holder serving to secure a guide, u, to the head P, the end of said guide being adapted to bear against the uncut portion of the watch-back or other piece of work applied to the chuckc.

Visa horizontally-swinging plate having on its upper surface a tongue, v, that enters a dovetail groove on the under sidevof head P, the rear end of said plate being pivoted at v to a sliding plate, W. The front end of plate V is circular, being concentric with the pivot v', and has a worm, 1;,cut in it, which worm engages with a tangent screw, X, that turns Within a bearing, Y, said bearing having a vertical shank, i, journaled. in a housing, x, attached to the sliding plate W.

y is a spring that maintains the tangent screw in gear with the worin-segment, which spring may be arranged as seen in Fig. 7 or as represented in Fig. 9; but the latter c0nstruction is preferred.

`Z isa T-shaped groove on the under side of the swinging plate V, said groove being concentric with the pivot c and adapted to receive screws z z', tapped into the plate W, for the purpose of preventing any lifting of the free end of said swinging plate V. Sliding plate W is grooved transversely on its under side to receive the dovetail tongue 2, running longitudinally of the bed-piece 3, said bed being usually integral with the base 4, and having a leading-screw, 5, wherewith said plate is shifted. This screw has a ratchet-wheel, 6,`

operated by the pawl 7 of lever 8, the swing of the latter being regulated by a pair offadj ustable'stoppins,9 9', engaged with the curved slot 10.

11 is a crank wherewith the leading-screwV 13 is a nut that engages with the lower end of i screw 12, and thus retains the base of the sliderest in any desired position.

My machine is operated in the following manner: The engraved roll or die O is first properly tted to the bearings o o', and the watch-back or other article to be engraved is IOO lIO

universal-joint connections k n' permitting these changes to be'readilyeffectedand yet keeping the roll ingear with saidshaft. Screw T is then adj usted to limit the advance strokef of tool-.carriage S and the consequent depth of cut of the graver or chaser s, and the sliderest head P is also advancedto bringl the guide` u in contact with thesurface of the work. The operator then turns the handle b. in such a manner as to revolve the chuck c in the direction of theV arrow seen on the pulley c in Fig. l, which turning of the handle sets the gear-wheels d, d, d, g, g", H, L, and lf in motion. Thismotion is accordingly transmitted tothe roll O, and as the-springs g q' force the head-slide-Q forward itis apparentthat the stub or tracer r is constantlyincontact with the engraved or otherwise ornamented periph-l` ery of said roll. 'Iherefore as theroll'revol-ves this tracer follows every elevation and indentar l tion in the same, thereby producing a reciproeating motionof the slide Q, which motion is imparted to the tool-carriage S by Ymeans of the link r'f.

' It will" thus be seen that the graver traces on the work-an exact reproduction of the pattern. on the roll or die, and as soon as the chuck has made one complete revolution the operatorfceases to turn the handle b. and immediately retracts the Ihead P.V` The leading-screw 5 is now turned for the purpose of advancing the sliding plate Wand its attachmentsalong the bed-piece 3, so astobring the graverin front of another uncut surface of the 'work or blank. The yfeed-screw r is also turned to ad-l .vance the traversing-block R, and thereby cause the tracer'rlto operate against avnew portionof the roll. The head P is again advanced and the aboverdescribed operations repeated untill the graver reaches the position seen in Fig. 3, when the work will be' finished. While lthese operations are being carried out it may be necessary to give aswinging motion to the slide-rest, so as =toenable-the graver to a acton acrowning ysur-face of thevwork, which motion is readily effected by turning thetangent-screw X. j The, proper turning Aof this screw swings the plateV horizontally on the pivot Tv', and'consequently the head P and all attachments to the same partake of this swinging movement. After this swinging movement .hasfbeeu accomplished, the housingYican be turned `on its pivot y, so as to disengage the screw Xfrom the worm v,f and thereby allow the. plate Vtobe-rat onceswung backj toits normalposition. It will'lthu's beseen that my compound slide-restis capableof being y" readily and securely adj usted in such a manner Yas toenable its graver or `other cutting-tool -to i operate on crowning, iiat, or any oth er shaped work orblank.l Finally, by detachingthe'pim v ion gv and substituting a larger or smaller-'piu-5 ion in its place the roll O; will be driven atal greater or less velocity with reference to the -speed of 'the chuck; but previous tomaking this change ythe nut f mustlbe slackened to enable the raising of lever kE, so as to convenientaccess.torsaidpinion. I claim as my invention`l yobtain V1. The combinatiomin anengravingfand' i f chasing machine, of aspindleprovided'witha g chuck or other means'of attaching the-blank, a slide-resthaving the ornamented roll ordie.

ting-tool, a swinging leverprovided with gears Y that communicate motion fromsaidspindle to" a counter-shaft, anda flexible coupling coml-y Y' municating motion from said shaft tofsaidroll,

substantially-as described. v 2.v The combination,- in anengravingiiandf chasing machine, of a spindle providedwith a chuck or other-means of'attachingi'theblank, A

a slide-rest'having the ornamented roll -orl die f9S j ournaled in it andcarrying the tracer` yaudcut ting-tool, a train of gearing communicating motion from said spindle to a longitudinally#` shiftable "countershaft,'and a flexible coupling communicating motion from jsa'id shaft to said roll, substantially'asdescribed.

3. The combination, in anl ,engraving and; vchasing machine, of mainspindle C, provided `with a; chuck, e", an adjustable slide-rest hawY f ing the'ornamented roll orgdie O journaledin- `it and carrying the tracervrand cutters', af

train of lgear-wheels, as d, 'd,`d"'q, g'f, and EL' that-communicate motion from'saidspiudleitof the longitudinally-'shiftable shaft I 11, and gears 'g '1 Io a', thatcommunicate motion from said shaftto L l', shafts K'k N n, and flexible `couplings'c rsaid roll," 'substantially as described.

4.'rv A slide-restfor an engraving and chasing machine, which rest combines the head P=p', carrying the roll-bearingsro o,`-reciprocating head-slide Q q",traversing blockyR, feed-screwi r, reciprocating tool-carriage S s,"link r, and 9 one or more'springmg, the swinging plateV c, i

pivoted at o to the slidingplate Wj andprovided with a worm, o, driven by a'screw, X,

applied to said plate W, and the bed 3,-ljlavi'ngv a guide, 2, and leading-[screw 5, as described.

" 5. The combination', inan lengraving and i chasing machine, of aslidewest head, P,Ypijo2fii vided .with roll-bearingso o,-a reciprocating head-slide, Q, a 11nk,fr, that communicates' Imotion from said slide to the tool-carriageS, a -f 1 Y a feed-screw, @for shifting saidYV blockyand one br more springs, as q, for adVancng-SadsHde, `as herein described.' i 1 y6. The'v combination, vinan `engraving'and H Vtraversing block, R, mounted u pon said slide,

85 I' journaledint andcarrying the tracer and cutchasing machine, ofthesliding plate W, swingthe head of the latter being graduated, forthe ingplate V v o', Worm n, screw X,Vbearin 9: Y, purpose described. Io shank y, spring y', and bearing w, which latter In testimony whereof I aix my signature in is secured to said slidingplate, for the purpose presence of two witnesses. 5 described. JOHN A. COBURN.

7. The combination, in an engraving and Witnesses: chasing machine, of the s1ide-rest head P, re- H. J. GAIN, ,f

ciprocating tool-carriage S, and stop-screw T, ALLEN WEBSTER. 

